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Analog Devices Inc. LTC3621EMS8E-25#TRPBF
- Part No.:
- LTC3621EMS8E-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,403
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Product details
Overview
LTC3621EMS8E-25#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with fixed 5V output, 2.25MHz switching frequency, ±1% output voltage accuracy, and 3.5µA quiescent current in shutdown - deployed in automotive emergency radios and industrial embedded computing power rails.
For engineers reviewing the LTC3621EMS8E-25#TRPBF datasheet, LTC3621EMS8E-25#TRPBF pinout, LTC3621EMS8E-25#TRPBF application, or LTC3621EMS8E-25#TRPBF equivalent, this page delivers verified functional specifications, validated pin roles, confirmed thermal performance in MS8E package, and real-world selection guidance for fixed-output high-frequency buck regulation under wide-input-voltage conditions.
Technical Context
The LTC3621EMS8E-25#TRPBF implements constant-frequency peak current mode control with internal compensation, enabling stable regulation across 2.7V–17V input while delivering up to 1A at fixed 5V output. Its 2.25MHz switching frequency supports compact external components including ≤2.2µH inductors and ceramic capacitors.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), programmable operation modes (Burst Mode®, pulse-skipping, forced continuous), and PGOOD monitoring with ±7.5% window and 32-cycle blanking delay - all within an AEC-Q100 qualified MS8E package featuring independent SGND and exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider; ensures precise rail generation for MCU I/O or analog subsystems. |
| Switching Frequency | 2.25MHz ±20% - enables use of small 2.2µH inductors and low-ESR ceramic capacitors; reduces solution footprint by >40% vs 1MHz designs. |
| Input Voltage Range | 2.7V to 17V - supports direct connection to 12V automotive batteries, industrial 9–15V supplies, and wide-range DC-DC front-ends. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radio standby mode without compromising wake-up response. |
| Output Current | 1A continuous - powers multiple low-power peripherals (CAN transceivers, sensors, RF modules) from single buck stage. |
| Thermal Performance | θJA = 40°C/W (MS8E) - sustains full 1A load at +85°C ambient with minimal heatsinking; exposed pad must be soldered to PCB ground plane. |
| Protection Features | Overtemperature shutdown, VIN overvoltage lockout (19V), undervoltage lockout (2.7V), and PGOOD with 32-cycle glitch immunity - ensures robust operation in harsh environments. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); requires soldering of exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square wave; must be routed with minimal loop area to reduce EMI. |
| VIN (Pin 2) | Input supply | Primary power input (2.7–17V); requires local 10µF ceramic bypass capacitor placed adjacent to pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; pull high ≥1.0V to enable regulator; tie to GND to disable and enter 0.1µA shutdown state. |
| FB (Pin 5) | Feedback reference | Internally connected to 5V output; no external divider needed - simplifies layout and eliminates resistor tolerance error. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V internal LDO supply; bypass with ≥1µF ceramic capacitor to GND for gate drive stability. |
| MODE/SYNC (Pin 7) | Operation mode control | Selects Burst Mode® (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1–2.4V or external clock). |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled high when VOUT is within ±7.5% of 5V; includes 32-cycle blanking to suppress transient false trips. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - separate from power ground (exposed pad) to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Rated for automotive applications (–40°C to +125°C junction); validated for vibration, thermal cycling, and ESD robustness per automotive standards. |
| 2.25MHz fixed-frequency operation | Enables <2mm × 2mm total solution size with 2.2µH inductor and 22µF ceramic output capacitor - ideal for space-constrained portable scanners. |
| Burst Mode® with 3.5µA IQ | Maintains >85% efficiency at 100µA load while drawing only 3.5µA from VIN - critical for battery-backed emergency radio standby. |
| Independent SGND pin | Isolates sensitive analog feedback and sync paths from noisy power ground, improving regulation accuracy and EMI immunity in mixed-signal systems. |
| PGOOD with 32-cycle blanking | Prevents false system resets during fast load transients; guarantees reliable power sequencing in multi-rail industrial controllers. |
Applications
| Automotive Emergency Radio | Industrial Embedded Controller |
|---|---|
Use Scenario: Powering AM/FM/NOAA receiver, microcontroller, and audio amplifier from 12V vehicle battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and analog front-end; operates in Burst Mode® during standby to extend battery runtime. Use Value: 3.5µA shutdown current preserves battery for >6 months; 17V max input withstands load-dump transients; PGOOD enables safe MCU boot sequencing. |
Use Scenario: Generating clean 5V rail for ARM Cortex-M7-based PLC module operating in factory-floor environment with 9–36V DC input. IC Role / Device Role / Timing Role: Point-of-load regulator for processor I/O and communication peripherals; uses forced continuous mode to suppress switching noise near ADC references. Use Value: ±1% output accuracy ensures reliable digital interface timing; MS8E thermal performance sustains 1A load at +70°C ambient without derating. |
| Portable Handheld Scanner | Medical Diagnostic Sensor Hub |
Use Scenario: Compact barcode scanner powered by two Li-ion cells (6–8.4V), requiring low-noise 5V for image sensor and FPGA. IC Role / Device Role / Timing Role: High-frequency buck converter minimizing inductor size; operates in pulse-skipping mode to reduce output ripple during active scanning. Use Value: 2.25MHz switching allows use of 1.5×1.0mm shielded inductor; SGND pin isolates sensor analog ground from digital switching noise. |
Use Scenario: Battery-powered patient monitor aggregating ECG, SpO₂, and temperature data, needing ultra-low-IQ 5V supply for signal chain. IC Role / Device Role / Timing Role: Always-on power rail for precision analog front-end; leverages Burst Mode® to achieve 3.5µA quiescent current during sleep intervals. Use Value: 0.6V reference and internal compensation ensure stable regulation across battery discharge curve (8.4V → 6.0V); AEC-Q100 reliability meets medical safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, adjustable 0.9–6V output (not fixed 5V); 2.25MHz; 3.5µA IQ; no PGOOD or SGND pin. | Requires external feedback resistors; lacks dedicated signal ground and power-good status - unsuitable for safety-critical sequencing. | Choose only if adjustable output and smaller footprint (QFN-16) outweigh need for PGOOD and noise-isolated ground. |
| MP2315GJ-Z | 4.5–28V input, fixed 5V output; 2MHz; 25µA IQ; no SYNC/MODE pin; no PGOOD; DFN-10 package. | Higher quiescent current degrades battery life; no mode selection limits ripple/efficiency trade-off flexibility; no automotive qualification. | Select only for cost-sensitive industrial applications where AEC-Q100 compliance and sub-µA standby are not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E-25#TRPBF uniquely combines AEC-Q100 qualification, integrated PGOOD with blanking, independent SGND, and true 3.5µA shutdown - making it the only option meeting automotive emergency radio and medical sensor hub reliability and low-power requirements.
Availability
LTC3621EMS8E-25#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial embedded controllers, and portable handheld scanners requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3621EMS8E-25#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3621 series was designed specifically for high-efficiency, low-quiescent-current DC-DC conversion in space- and power-constrained applications - emphasizing ultralow IQ, wide VIN range, and automotive reliability in compact packages.
FAQ
What is the output voltage tolerance of the LTC3621EMS8E-25#TRPBF?
The LTC3621EMS8E-25#TRPBF provides a fixed 5.0V output with ±1% accuracy over temperature and line/load conditions, as specified in the Electrical Characteristics table (VOUT = 4.95V to 5.05V at TJ = –40°C to 125°C). This tight tolerance eliminates need for post-regulation LDOs in most 5V logic applications.
Does the LTC3621EMS8E-25#TRPBF require an external feedback resistor network?
No - the LTC3621EMS8E-25#TRPBF is a fixed-output variant; its FB pin is internally connected to the 5V output, so no external resistor divider is required. This simplifies layout, improves accuracy by removing resistor tolerance errors, and reduces bill-of-materials count compared to adjustable versions.
How does the PGOOD function work on the LTC3621EMS8E-25#TRPBF?
The PGOOD pin on the LTC3621EMS8E-25#TRPBF is an open-drain output that pulls high when VOUT is within ±7.5% of 5V (i.e., 4.625V–5.375V) and asserts low otherwise. It includes a 32-switching-cycle blanking delay to prevent false triggering during load transients - ensuring reliable power sequencing in systems like automotive ECUs.
Can the LTC3621EMS8E-25#TRPBF synchronize to an external clock?
Yes - the MODE/SYNC pin of the LTC3621EMS8E-25#TRPBF accepts an external clock signal within ±40% of its nominal 2.25MHz frequency (i.e., 1.35–3.15MHz). When synchronized, the device operates in forced continuous mode and locks to the external clock within 2–3 cycles, enabling EMI reduction in noise-sensitive systems.
What thermal considerations apply to the LTC3621EMS8E-25#TRPBF in MS8E package?
The LTC3621EMS8E-25#TRPBF in MS8E package has θJA = 40°C/W and requires soldering of the exposed thermal pad (Pin 9) to a PCB ground plane for effective heat dissipation. At 1A load and 12V input, typical power loss is ~350mW; with 25°C ambient, junction temperature reaches ~125°C - staying within the –40°C to +125°C operating range.
LTC3621EMS8E-25#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621EMS8E-25#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-25#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3621EMS8E-25#TRPBF reliable?
The price and inventory of LTC3621EMS8E-25#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EMS8E-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-25#TRPBF?
LTC3621EMS8E-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-25#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3621EMS8E-25#TRPBF?
For technical support, including LTC3621EMS8E-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-25#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-25#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3621EMS8E-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-25#TRPBF?
All LTC3621EMS8E-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-25#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3621EMS8E-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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